CN100582645C - Measurement instrument - Google Patents
Measurement instrument Download PDFInfo
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- CN100582645C CN100582645C CN200610108011.7A CN200610108011A CN100582645C CN 100582645 C CN100582645 C CN 100582645C CN 200610108011 A CN200610108011 A CN 200610108011A CN 100582645 C CN100582645 C CN 100582645C
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- 238000005259 measurement Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims description 54
- 238000010168 coupling process Methods 0.000 claims description 54
- 238000005859 coupling reaction Methods 0.000 claims description 54
- 230000007246 mechanism Effects 0.000 claims description 23
- 230000033228 biological regulation Effects 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 description 26
- 238000005070 sampling Methods 0.000 description 8
- 230000006698 induction Effects 0.000 description 7
- 230000001965 increasing effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
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- 230000004304 visual acuity Effects 0.000 description 2
- 230000005465 channeling Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/18—Micrometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
- G01D5/2086—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by movement of two or more coils with respect to two or more other coils
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
A measuring instrument has a phase signal transmitter (400) that transmits, in accordance with a rotation of the spindle (300), a phase signal that differs corresponding to the rotation angle of the spindle (300), and an arithmetic processor (500) that arithmetically processes the phase signal to obtain the absolute position of the spindle. The phase signal transmitter transmits the phase signal at a predetermined pitch. Since the phase signal differs corresponding to the rotation angle of the spindle (300), a rotation angle of the spindle (300) is uniquely determined by the phase signal. Unlike an increment type measuring instrument, since there is no concern that the signal will be skip-read, the spindle (300) can be rotated at high speed, so that operational performance of the micrometer (100) can be improved. Further, since there is no concern that the signal will be skip-read, the phase signal can be minutely varied with respect to the rotation of the spindle (300).
Description
Technical field
The present invention relates to analyzer, for example relate to by making measuring staff advance and retreat measure the analyzer of the size etc. of determinand, for example first-class with milscale or micrometer is the analyzer of representative.
Background technology
In the past, by measuring staff being advanced and retreat measure the first-class analyzer of the milscale of determinand size or micrometer known (for example document 1: open clear 49-80260 communique and document 2 in fact: the spy opens clear 54-130152 communique) to screw togather rotation.
This analyzer has: body, and it has internal thread; Measuring staff, it has the feeding screw thread with the internal screw-thread screw of body; Rotation detecting circuit, it detects the rotation of measuring staff; Operation processing unit, it is according to the shift amount of asking measuring staff from the signal of rotation detecting circuit output.
In such analyzer, come the regulation measuring staff whenever to revolve the shift amount that turns around by the pitch that is arranged on the feeding screw thread on the measuring staff, the pitch of feeding screw thread for example generally is to be arranged to 0.5mm.Rotation detecting circuit for example has: rotor, and itself and measuring staff one are rotated; Stator, it is fixed on the body with the state relative with rotor; Phase calculation unit, it will calculate the rotatable phase of rotor according to the rotation of rotor from the signal increment of stator output.
Figure 11 A and Figure 11 B represent the opposite face that rotor 1 and stator 2 are mutual.
Shown in Figure 11 A, stator 2 has: sender electrode 21, and it is made of a plurality of battery lead plate in the first-class arranged spaced of regulation circumference on the face relative with rotor 1; The receiving electrode 22 of ring-type, itself and sender electrode 21 concentric circles ground dispose, and the AC signal that will modulate phase place from pulse-modulator sends to each battery lead plate of sender electrode 21.Sender electrode 21 is made of 16 battery lead plates, and the different AC signal of each 45 degree phase place is applied on each battery lead plate.Shown in Figure 11 B, rotor 1 possess on the face relative across the sender electrode 21 of stator 2 and receiving electrode 22 with stator 2 and relatively configuration and with the battery lead plate of sender electrode 21 in the battery lead plate of specified quantity carry out the coupling electrode 11 of electrostatic coupling.
In this structure, when measuring staff rotated, then the rotation that screws togather by body and measuring staff was advanced and retreat measuring staff in the axial direction.The rotation of measuring staff is at this moment detected by rotation detecting circuit.That is, when measuring staff rotated, then rotor 1 rotated with this measuring staff one.
When the AC signal with regulation gave each electrode of sender electrode 21, then current potential was pressed the order handing-over of sender electrode 21 → coupling electrode 11 → receiving electrode 22.Under the state of rotor 1 rotation, since sender electrode 21 and coupling electrode 11 carry out electrostatic coupling sender electrode 21 battery lead plate different and current potential coupling electrode 11 is just different, therefore, also just different with the current potential of the receiving electrode 22 of coupling electrode 11 electrostatic coupling.By being sampled with the sampling interval of regulation, the current potential of this receiving electrode 22 just obtains pulse signal, by this pulse signal being counted the rotatable phase of asking rotor by phase calculation unit.
Because the rotatable phase of rotor 1 equates with the rotatable phase of measuring staff, so just can obtain the displacement of measuring staff by operation processing unit according to the pitch (for example 0.5mm) of the rotatable phase and the feeding screw thread of measuring staff.
Wherein, when the externally threaded pitch on being arranged on measuring staff is 0.5mm or 0.635mm, then since measuring staff whenever to revolve the shift amount that turns around little, so when changing determination object, just measuring staff must be rotated repeatedly, problem be arranged on operability.
So, for example consider and whenever revolve the shift amount that turns around in order to increase measuring staff, the pitch of feeding screw thread is increased to 1mm and even 2mm, whenever revolve the advance and retreat amount that turns around thereby increase measuring staff.
Though, if the pitch of feeding screw thread is increased to 1mm and even 2mm, whenever revolve the advance and retreat amount that turns around owing to increased measuring staff, improve operability greatly so increased the walk rate of measuring staff.
Yet the amount that increases with the pitch of feeding screw thread correspondingly must improve the accuracy of detection and the detection resolution of rotation detecting circuit.This be since for example the pitch of feeding screw thread become original 4 times and the detection resolution of phase place is kept intact, then make the detection resolution of measuring staff shift amount become original 1/4 cause simply.
To this, whenever revolve the detection resolution that turns around in order to improve measuring staff, consider the battery lead plate miniaturization of sender electrode 21 is accelerated, come the detection rotor 1 small anglec of rotation to change.Yet when increasing the battery lead plate of sender electrode 21, to carry out the battery lead plate of sender electrode 21 of electrostatic coupling different with coupling electrode 11 owing to the small rotation of rotor 1 makes, so that the cycle of the potential change of receiving electrode 22 shorten.
Therefore, in the phase calculation unit detection mistake of pulse signal etc. that can usually occur skipping, thereby produce the problem that the angle that can't follow the tracks of rotor 1 exactly changes.
And consider will sample to the current potential of receiving electrode 22 sampling period shorten, but the sampling period is because the speed of IC etc. and itself is restricted.In addition, when shortening the sampling period, owing to interference such as noise are blended in the pulse signal easily, so there is the problem that accuracy of detection is reduced on the contrary owing to electrical interference from the outside.And, when shortening the sampling period, there is the power consumption increase and problem that battery life shortens.
Therefore, because with respect to the big channeling (Ha イ リ one Deization) of feeding screw thread and can not high precision and high resolving power ground detect the displacement of measuring staff, so be desirable to provide out have can the high speed feed measuring staff good operability and accuracy of detection and the high analyzer of detection resolution.
Summary of the invention
The analyzer that provides a kind of good operability and accuracy of detection and detection resolution high is provided fundamental purpose of the present invention.
Analyzer of the present invention is characterized in that, has: body; Measuring staff, it is screwed on the described body and is arranged to freely advance and retreat in the axial direction by rotation; The phase signal transmitting element, it sends the phase signal of different value with respect to the different rotary angle of measuring staff according to the rotation of described measuring staff; And operation processing unit, it carries out the absolute position that calculation process is asked described measuring staff to described phase signal, wherein, described phase signal transmitting element interval in accordance with regulations sends described phase signal, described operation processing unit has: anglec of rotation calculating part, and it calculates the anglec of rotation of described measuring staff according to described phase signal; The rotating cycle calculating part, its anglec of rotation according to the described measuring staff that described anglec of rotation calculating part calculates comes the rotating cycle of described measuring staff is counted; Total rotatable phase calculating part, it calculates total rotatable phase of described measuring staff according to the rotating cycle of the measuring staff of being counted by described rotating cycle calculating part and the anglec of rotation of the measuring staff that described anglec of rotation calculating part calculates; And measuring staff position calculation portion, the absolute position that it calculates described measuring staff according to total rotatable phase of the described measuring staff that is calculated by described total rotatable phase calculating part.
In this structure, when the rotation measuring staff, measuring staff is advanced and retreat with respect to body by screwing togather of measuring staff and body.At this moment, send the phase signal corresponding from the phase signal transmitting element accordingly with the rotation of measuring staff with the anglec of rotation of this measuring staff.This phase signal is different values with respect to the different anglec of rotation of measuring staff.In addition, anglec of rotation θ is in the scope of 0 °≤θ＜360 °, promptly is called and revolves the phase place that turns around with interior.Determine the anglec of rotation of measuring staff uniquely by anglec of rotation calculating part according to this phase signal.In addition, owing to calculate the anglec of rotation of measuring staff successively by anglec of rotation calculating part, so can calculate the rotating cycle of measuring staff by the rotating cycle calculating part according to the anglec of rotation of the measuring staff that calculates.For example when the anglec of rotation of the measuring staff that is calculated by anglec of rotation calculating part is 5 ° → 95 ° → 185 ° → 275 ° → 365 ° such variations,,, the rotating cycle calculating part rotated a positive circle so just counting measuring staff because measuring staff revolves and makes a circle.
According to the anglec of rotation of the measuring staff that calculates by the rotating cycle of the measuring staff of rotating cycle calculating part counting with by anglec of rotation calculating part, calculate total rotatable phase of measuring staff by total rotatable phase calculating part.For example, if the rotating cycle of measuring staff is 2, the anglec of rotation is 45 °, and then total rotatable phase is 765 ° (=360 ° * 2+45 °).Then, the absolute position of calculating measuring staff by measuring staff position calculation portion according to the total rotatable phase that calculates by total rotatable phase calculating part.For example, whenever revolving the advance and retreat pitch that turns around at measuring staff is 2mm, and total rotatable phase is under 765 ° the situation, and the absolute position of measuring staff is 4.25mm (360 ° of=765 ° of ÷ * 2mm).
According to this configuration, when basis is asked the anglec of rotation of measuring staff from the phase signal of phase signal transmitting element, because with respect to the different anglec of rotation of measuring staff and phase signal is different value, so can determine the anglec of rotation of measuring staff uniquely according to phase signal.In the past, owing to detect the rotatable phase of measuring staff by pulse signal increment that will be corresponding with the rotation of measuring staff, so when the variation of the pulse signal of relative measuring staff rotation is too fast, the skipping frequent generation of signal and can't detect the rotatable phase of measuring staff exactly then.Therefore, can only be that rotational speed or the minimizing measuring staff that limits measuring staff whenever revolves the signal change frequency that turns around and carry out increment exactly.But owing to when limiting the rotational speed of measuring staff, limited the advance and retreat speed of measuring staff, thus the operability variation of analyzer, and, whenever revolve the signal change frequency that turns around if reduce measuring staff, then produce the problem of the resolution reduction of the anglec of rotation.
And this point is in the present invention owing to can determine the anglec of rotation of measuring staff uniquely according to a phase signal that sends from the phase signal transmitting element, so not needing to resemble in the past with the signal increment.Therefore, owing to can not occur the problem that causes that signal is skipped etc. owing to high speed rotating in the present invention, so do not need to limit the rotating speed of measuring staff, allow the high speed rotating of measuring staff, thereby can improve the operability of analyzer.And, even the such high speed rotating of measuring staff also can be used to ask from the phase signal of phase signal transmitting element the anglec of rotation of measuring staff.
And, because the problem that do not have signal to skip, so can make fine and closely wovenization of variation of phase signal of the rotation of relative measuring staff.
Fine and closely wovenization of variation of the phase signal of the rotation by making relative measuring staff in this wise can improve the resolution for the measuring staff anglec of rotation.In addition, because needing only with the interval transmission phase signal of the degree of the rotating cycle of the measuring staff of can not skipping in the rotating cycle calculating part, the phase signal transmitting element just can, and the mode with increment is all carried out increment with signal not needing to resemble in the past, so can reduce the timing that signal sends, its result can reduce power consumption.
Like this, in the present invention, owing to possessing the phase signal transmitting element that the anglec of rotation different with respect to measuring staff sends the out of phase signal, so have following epoch-making effect, promptly, can allow the high speed rotating of measuring staff, improve the resolution of the anglec of rotation of measuring staff, and then can reduce power consumption.
In the present invention, preferably described phase signal transmitting element has: with described measuring staff rotor rotated integratedly; Be arranged on the described body and send stator with the corresponding phase signal of the anglec of rotation of described rotor with the state relative with described rotor, described stator, as the rotation that detects described rotor and send two sense channels of different mutually signals, have the first passage that sends first phase signal and send and first phase signal carries out the second channel of second phase signal of different cycle variations, with respect to the different anglec of rotation of described rotor and the phase differential of described first phase signal and described second phase signal is different, described anglec of rotation calculating part calculates the anglec of rotation of described rotor according to described phase differential.
In this structure, when measuring staff rotated, then rotor rotated with measuring staff.So, detect the rotation of this rotor by stator.
Wherein, when first passage that the transmission phase signal is set and second channel, export first phase signal in stator, export second phase signal from second channel from first passage.First phase signal is expressed different cycle variations with second phase signal with respect to the rotation of rotor, since the phase differential of first phase signal and second phase signal rotor revolve turn around with interior be different values with respect to the different rotor anglecs of rotation, so according to this phase differential anglec of rotation of definite rotor uniquely.
And, because rotor and the rotation of measuring staff one so the anglec of rotation of rotor is exactly the anglec of rotation of measuring staff, just can be obtained the absolute position of measuring staff according to the anglec of rotation of this measuring staff.
According to this configuration, according to the phase differential of representing two phase signals (first phase signal, second phase signal) that different cycles changes with respect to the rotation of rotor, can determine the anglec of rotation of rotor uniquely.And, because the phase differential anglec of rotation different with respect to rotor of two phase signals (first phase signal, second phase signal) is different values, if, just can obtain the anglec of rotation of rotor so first phase signal and second phase signal are sampled and obtained the phase differential of two signals.Therefore, owing to do not need with signal increment successively, not problem soon so the cycle of phase signal changes, allow the measuring staff high speed rotating, and then, fine and closely wovenization of variation of the phase signal of the rotation by making relative measuring staff and can improve resolution for the measuring staff anglec of rotation.
In addition, as long as just since can utilize the phase differential of a plurality of phase signals come certain rotor the anglec of rotation can, so can certainly on the basis of first phase signal, second phase signal, add the 3rd, the 4th phase signal.
In the present invention, preferably described stator has: be applied in the sender electrode of AC signal and have specified quantity and receiving electrode as the corresponding test pattern of the phase change of the one-period of a unit, described rotor has: carry out electromagnetic coupled with described sender electrode and described receiving electrode and have coupling electrode with the test pattern of described receiving electrode respective amount.
In this structure,, then around sender electrode, induce induced field by the electric current of this sender electrode when when sender electrode applies AC signal.And by carrying out inducing induction current in the coupling electrode of electromagnetic coupled with sender electrode at the induced field that induces around this sender electrode.And around coupling electrode, induce induced field by the induction current of this coupling electrode.And by carrying out inducing induction current in the receiving electrode of electromagnetic coupled with coupling electrode at the induced field that induces around this coupling electrode.That is, signal joins with the order of sender electrode → coupling electrode → receiving electrode.At this moment, the overlapping degree of coupling electrode and the test pattern of receiving electrode is because the anglec of rotation of rotor and different, so change on the signal period property ground of receiving electrode induction accordingly with the rotation of rotor.So, by the signal of this receiving electrode is sampled with the interval of regulation, rotatable phase that can detection rotor.
According to this structure, coupling electrode and receiving electrode are the electrode channels with periodically variable test pattern, thereby coupling electrode and receiving electrode can be made of the electrode wires that the transmission of carrying out signal by electromagnetic coupled receives.For example, the test pattern of coupling electrode and receiving electrode is all constituted by arranging a plurality of coils, different with the overlapping degree of the coil pattern of receiving electrode and can access the signal of out of phase by the coil pattern of coupling electrode.And, when constituting test pattern by electrode wires owing to compactly form easily the figure of electrode wires, so compactly form coil figure one by one and easily with fine and closely wovenization of variation of the phase signal of the rotation of relative rotor.Its result can improve the resolution for the rotor anglec of rotation.
In addition, the battery lead plate that carries out electrostatic coupling is being set respectively on the opposite face of rotor and stator resembling in the past, utilize the potential change of these battery lead plates to come under the situation of the anglec of rotation of detection rotor, exist when the gap of rotor and stator changes, the current potential that makes battery lead plate changes and the problem of the anglec of rotation of detection rotor exactly.
And this point in the present invention, because the sender electrode of stator and the coupling electrode of receiving electrode and rotor carry out the signal handing-over by electromagnetic coupled, so be not subjected to the influence of stator and gap between rotor variation, thereby can detect the anglec of rotation of rotor exactly.
In addition, be not limited only on rotor, be provided with the situation of coupling electrode in that sender electrode and receiving electrode are set on the stator, and sender electrode and receiving electrode can be set on rotor on the contrary, and coupling electrode is set on stator, and then, also sender electrode, coupling electrode and receiving electrode can be separately positioned on the independent parts, that is to say as long as sender electrode, coupling electrode and receiving electrode carry out electromagnetic coupled and just can.
In the present invention, preferably described body possesses the measuring staff operating portion of the described measuring staff rotation of the enough manual operations of energy, under the high rotation speed of the measuring staff that the manual operation by described measuring staff operating portion can reach, described phase signal transmitting element comes described phase signal is sampled to revolve the interval of obtaining the described phase signal more than three times in the time of turning around at least at measuring staff.
In this structure, when making the measuring staff rotation with manual operation measuring staff operating portion, then measuring staff is rotated.So, from phase signal transmitting element output phase signal.By the anglec of rotation of anglec of rotation calculating part according to this phase signal calculating measuring staff, and then, by monitoring the anglec of rotation that calculates by anglec of rotation calculating part successively, calculate the rotating cycle of measuring staff by the rotating cycle calculating part.Owing to the rotating cycle of measuring staff is counted, so the phase signal transmitting element need send phase signal with can the not skip interval of rotating cycle degree of measuring staff of rotating cycle calculating part by the rotating cycle calculating part.
And this point in the present invention, because as long as export three phase signals from the phase signal transmitting element in during with manually operated measuring staff top speed measuring staff being revolved to turn around, just can follow the tracks of the rotation of measuring staff, so at can the not skip rotating cycle of measuring staff of rotating cycle calculating part.On the other hand, because as long as the phase signal transmitting element sends phase signal is just can in can the not skip degree of rotating cycle of measuring staff of rotating cycle calculating part at interval, so compare with existing increment type, reduced the number of times of phase signal sending part transmission phase signal widely.And, since measuring staff whenever revolve turn around as long as three phase place signals of output just can, reach the degree identical so can allow the rotational speed of measuring staff conversely with the phase-detection speed of phase signal transmitting element.Its result can allow the measuring staff high speed rotating, thereby can improve the operability of analyzer.
In the present invention, the quantity that preferably is arranged on the test pattern on described receiving electrode and the coupling electrode is more than 9.
In this structure, when making measuring staff when rotation, then rotor rotates with measuring staff, and with the anglec of rotation of this rotor accordingly from stator output phase signal.The anglec of rotation of coming detection rotor according to this phase signal, the i.e. anglec of rotation of measuring staff.Because the phase signal transmitting element anglec of rotation different with respect to measuring staff sends different phase signals, so can be calculated the anglec of rotation of measuring staff by anglec of rotation calculating part uniquely according to a phase signal.At this, under the situation of the phase signal by the signal increment being calculated measuring staff resembling in the past, in order signal not to be skipped, increment is carried out exactly and reduce the change frequency that measuring staff whenever revolves the signal that turns around.Therefore, produce the confined problem of resolution of the measuring staff anglec of rotation.
And this point is in the present invention since not needing to resemble in the past with the signal increment, so the problem that does not have signal to skip, thereby can make fine and closely wovenization of variation of the phase signal of relative measuring staff rotation.That is, the test pattern of receiving electrode and coupling electrode is increased, and make fine and closely wovenization of variation of the phase signal of relative rotor rotation, thereby can improve resolution for the measuring staff anglec of rotation.
In the present invention, preferably described measuring staff whenever revolves and turns around more than the displacement 1mm.
Specifically, preferably described body has internal thread, and described measuring staff has the feeding screw thread with the internal screw-thread screw of described body, and the pitch of described internal thread and described feeding screw thread is more than the 1mm.Perhaps preferably described feeding screw thread is many screw threads.
In this structure, because when measuring staff rotated, then measuring staff whenever revolved to turn around and just advances and retreat more than the 1mm, so the advance and retreat speed of measuring staff is fast, has improved the operability of analyzer.
At this, be to calculate the phase signal of measuring staff by the signal increment that will send according to the rotation of measuring staff in the past, in order signal not to be skipped, to reduce the change frequency that measuring staff whenever revolves the signal that turns around increment is carried out exactly.Therefore, produce the confined problem of resolution of the measuring staff anglec of rotation.
And this point is in the present invention since not needing to resemble in the past with the signal increment, so the problem that does not have signal to skip can make fine and closely wovenization of variation of the phase signal of relative measuring staff rotation.Therefore, whenever revolve the advance and retreat pitch that turns around even increase measuring staff, fine and closely wovenization of variation of phase signal that also can be by making relative measuring staff rotation also improves the resolution of the measuring staff anglec of rotation, improves the detection resolution of the absolute position of measuring staff.That is, can have the advance and retreat pitch that increases measuring staff and improve operability and can also improve the epoch-making like this effect of resolution of measuring staff absolute position.
In the present invention, preferably described measuring staff has the holding section that is provided with vertically, and described phase signal transmitting element has: be arranged on the described rotor and the engagement pin that engages with described holding section; And the precompression that described engagement pin is carried out precompressed to described holding section gives mechanism.
In this structure, when the rotation measuring staff, then the holding section by measuring staff is delivered to the rotation of measuring staff on the rotor with the engaging of engagement pin of rotor.Like this, rotor only is rotated in the same manner with the anglec of rotation of measuring staff, and the anglec of rotation of rotor is read by stator.Therefore, can know the anglec of rotation of measuring staff, and whenever revolve the pitch that turns around according to measuring staff and can know the shift amount of measuring staff.
According to this structure, owing to give mechanism engagement pin is carried out precompressed to the holding section by precompression, so engagement pin seamlessly engages reliably with the holding section, the rotation of measuring staff can be delivered on the rotor exactly.Therefore, just can detect the anglec of rotation of measuring staff exactly by the anglec of rotation that reads rotor by stator.For example, whenever revolve under the big situation of the advance and retreat amount that turns around at measuring staff, owing to, then can not improve the detection resolution of measuring staff position, so even the minim gap of engagement pin and holding section also detects big influence not with the anglec of rotation of high resolution detection measuring staff.
And this point in the present invention, owing to give mechanism by precompression engagement pin seamlessly engaged with the holding section, so the rotation of measuring staff can be delivered on the rotor exactly.Its result can improve the mensuration precision.
In the present invention, preferably described engagement pin be configured to respect to described rotor with the direction of the axial quadrature of described measuring staff on be free to slide, described precompression gives mechanism to have and is hung tag on described rotor and with the leaf spring of described engagement pin to the described holding section application of force.
According to this structure, owing to utilize the elasticity of leaf spring and engagement pin is carried out precompressed to the holding section, so can in the slip of guaranteeing engagement pin and holding section, engagement pin seamlessly be engaged with the holding section.Therefore, the rotation of measuring staff is delivered on the rotor exactly.Its result can reduce the reading error of the measuring staff anglec of rotation and improves the mensuration precision.
In addition, also engagement pin can be screwed in rotor, and engagement pin is screwed on the holding section that the front end that makes engagement pin effectively is connected to measuring staff unknown, and engagement pin be carried out precompressed to the holding section.
In the present invention, preferably described phase signal transmitting element has the engagement pin supporting device of described engagement pin with respect to described rotor fastening.
According to this structure, by the engagement pin supporting device with engagement pin with respect to the rotor fastening.Like this, though since with measuring staff when rotor is unloaded down, the position that also can keep engagement pin, thus when once more measuring staff being installed with respect to rotor just easily.For example, when with measuring staff when rotor is unloaded down, after engagement pin comes off from rotor, then when being installed to measuring staff on the rotor once more, engagement pin just becomes obstacle, perhaps engagement pin must be inserted rotor again and makes on its holding section that is fastened on measuring staff, so very bothersome.
And this point in the present invention since utilize the engagement pin supporting device and with engagement pin with respect to the rotor fastening, so even measuring staff is unloaded the position that also can keep engagement pin from rotor, thereby easily measuring staff is installed on the rotor.Therefore, can carry out the replacing etc. of measuring staff easily.
In the present invention, preferably described body has the measuring staff operating portion with the rotation of the described measuring staff of manual operation, and described measuring staff operating portion has: cup, and its lateral surface that is provided in described body can rotate; Prossure fixing mechanism, it is arranged between described cup and the measuring staff, when acting on load between this cup and the described measuring staff less than setting, its with the rotation of described cup to described measuring staff transmission, and when described load is setting when above, it dallies between described cup and described measuring staff.
In this structure, when making the cup rotation, less than given load the time, then the rotation of cup passes to measuring staff by Prossure fixing mechanism and makes the measuring staff rotation.So measuring staff is advanced and retreat.In addition, make cup when rotation when being given load when above, then Prossure fixing mechanism dallies and the rotation of cup can not pass to measuring staff.Because for example the idle running by Prossure fixing mechanism can not make measuring staff be rotated with the power more than the given load, so the contact pressure measuring staff can be contacted with determinand the time is limited in below the authorised pressure.Therefore can be owing to measuring staff makes the determinand breakage.
Particularly whenever revolve under the situation of the advance and retreat pitch that turns around at the increase measuring staff, though because measuring staff might make the determinand breakage to be shifted at a high speed, but this point in the present invention, owing to by Prossure fixing mechanism measuring staff can be rotated to stipulate above load, so can be owing to measuring staff makes the determinand breakage.
Description of drawings
Fig. 1 is the integrally-built figure of expression as the milscale of first embodiment;
Fig. 2 is the sectional view of first embodiment;
Fig. 3 is the figure of the shape of the feeding screw thread of measuring staff among expression first embodiment;
Fig. 4 is the figure of the structure of phase signal transmitting element among expression first embodiment;
Fig. 5 A and Fig. 5 B are the figure that is illustrated respectively in engagement pin and slot fastening state in the sectional view;
Fig. 6 is the figure that is illustrated in stator and rotor among first embodiment;
Fig. 7 is the figure of expression first variation;
Fig. 8 is the figure of expression second variation;
Fig. 9 is the figure of expression the 3rd variation;
Figure 10 is the figure of expression the 4th variation;
Figure 11 A is the figure of stator of the electrostatic capacitive rotary encoder of expression prior art, and Figure 11 B is the figure of the rotor of this scrambler of expression.
Embodiment
Below, embodiments of the invention are described with reference to each key element mark affixed among diagram and the figure.
(first embodiment)
First embodiment of analyzer of the present invention is described.
Fig. 1 is the overall diagram as the milscale 100 of first embodiment.
Fig. 2 is the sectional view of this milscale 100.
Fig. 3 is the figure of shape of the feeding screw thread 310 of expression measuring staff 300.
Fig. 4 is the figure of the structure of expression phase signal transmitting element 400.
One distolateral being connected on the front barrel 210 of rear barrel 220, and another distolateral interior internal thread 221 that screws togather with measuring staff 300 that has in week, and, another distolateral slit 222 that is processed with, and carry out nut from the outside with nut 223 and fix.
Measuring staff operating portion 230 has: guiding tube 231, and it is with respect to rear barrel 220 laminations; Outer sleeve 232, it is arranged to can rotate with respect to this guiding tube 231; Micrometer sleeve 234 is provided with friction spring 233 between itself and outer sleeve 232; Cup 235, it is distolateral that it is arranged on another of outer sleeve 232 and micrometer sleeve 234; Prossure fixing mechanism 240.
On first ratchet 242 and second ratchet 243, be formed with the tooth of intermeshing serration shape with a determining deviation, when not reaching authorised pressure, then the tooth of first ratchet 242 and second ratchet 243 is states of engagement, first ratchet 242 and second ratchet 243 rotate with becoming one, but during the load more than the field of conjugate action at first ratchet 242 and second ratchet 243 applies to a certain degree, then first ratchet 242 is with respect to 243 idle running of second ratchet.Second ratchet 243 is configured to can be with respect to bolster 241 to axially being shifted but can not pivot by key 244, and second ratchet 243 is rotated integratedly with bolster 241.
Measuring staff 300 inserts and connects microdrums 211 and distolateral outstanding to the outside from body 200, is provided with feeding screw thread 310 in another distolateral periphery, and screws togather with the internal thread 221 of rear barrel 220.The distolateral undergauge of another of measuring staff 300 becomes taper and is embedded the other end at outer sleeve 232.Be provided with slot (holding section) 320 on the measuring staff 300 vertically.
As shown in Figure 3, feeding screw thread 310 has bigger and the external thread that screw thread trench depth d is superficial of pitch P.That is, the pitch P of feeding screw thread 310 is the coarse pitch more than 2 times of the difference of external diameter R and minor diameter of thread r, and the difference of external diameter R and minor diameter of thread r is below 1/5th of external diameter R.When screw axis A saw, the screw thread ditch bar (thread groove bar) of adjacency formed the interval with regulation, between the screw thread ditch bar of adjacency, along portion (portion between groove) between having as the ditch that occurs along the straight line of screw axis A on the section of screw axis A.
The size of feeding screw thread 310 is, for example external diameter R is about 7.25mm～7.32mm, and minor diameter of thread r is about 6.66mm～6.74mm, and pitch P is about 1mm～2mm, and the vertex angle theta of screw thread ditch is about 55 °～65 °, and lead angle is about 5 °.
There is no particular limitation for the size of feeding screw thread 310, and measuring staff 300 whenever revolves the advance and retreat amount that turns around, and promptly what kind of degree is helical pitch set for and can suitably select.
For example, the pitch P of feeding screw thread 310 also can be 3 times, 5 times, 10 times of difference of external diameter R and minor diameter of thread r, and the difference of external diameter R and minor diameter of thread r also can be 1/7th, 1/10th of external diameter R.
Shown in Fig. 4, Fig. 5 A and Fig. 5 B, phase signal transmitting element 400 has: be arranged on stator 410 on the body 200, with transmission that the rotor 420 of these stator 410 relative configurations, control receive for the transmission of the signal of stator 410 receive control part 430, vertically be arranged on slot 320 on the measuring staff 300, be arranged on the rotor 420 and the engagement pin 421 that engages with slot 320, precompression that engagement pin 421 is carried out from precompressed to slot 320 give mechanism 440, with the engagement pin supporting device 450 of engagement pin 421 with respect to rotor 420 fastenings and supporting.
In Fig. 4, for structure being represented clear easily, more leave and stator 410 and rotor 420 depicted as than reality.
Narrate in the back about the structure of transmission reception control part 430 with by sending the signal controlling that receives 430 pairs of stators 410 of control part.
It is that the ring-type leaf spring 441 that is formed colyliform by a slice leaf spring coiling constitutes that precompression gives mechanism 440.Ring-type leaf spring 441 also can be the discontinuous annular shape that an end separates with the other end, and an end and the other end also can be overlapping.Ring-type leaf spring 441 is embedded the lateral surface at the rotor bushing 423 that is inserted with engagement pin 421 states, and with the butt of engagement pin 421 to measuring staff 300 application of forces.At this moment, outstanding 422 of little pins that are arranged on engagement pin 421 butts are inserted in the ring-type leaf spring 441 and can not pull-off, and 421 of engagement pins hang tag on ring-type leaf spring 441.
By like this engagement pin 421 being hung tag on ring-type leaf spring 441, just constituted engagement pin supporting device 450.Hung tag on ring-type leaf spring 441 by engagement pin on this engagement pin supporting device 450, shown in Fig. 5 B, even under the situation that measuring staff 300 is extracted from rotor 420, engagement pin can not come off from rotor bushing 423 yet, and the position of engagement pin is roughly kept.
Below, utilize stator 410 to come the principle of the rotatable phase of detection rotor 420 in the simple declaration phase signal transmitting element 400.
This phase signal transmitting element 400 is so-called circle rotation ABS (absolute sense) rotary encoders.
Fig. 6 (A), (B) are the figure of the mutual opposite face of expression stator 410 and rotor 420.
Fig. 6 (A) part is a face of expression stator 410, and Fig. 6 (B) part is a face of expression rotor 420.
On stator 410, the face relative with rotor 420 is provided with the electrode part of inboard and outside duplex configuration, be that the inboard is provided with the first stator electrode portion (first passage) 460, the second stator electrode portion (second channel) 470 (with reference to Fig. 6 (A)) arranged in the arranged outside of the first stator electrode portion 460.
The first and second stator electrode portions 460,470 are connected to send and receive control part 430.On rotor 420, the face relative with stator 410 is provided with the electrode part of inboard and outside duplex configuration, promptly the inboard is provided with the first coupling electrode portion 480 that carries out electromagnetic coupled with the first stator electrode portion 460, is provided with the second coupling electrode portion 490 (with reference to Fig. 6 (B)) that carries out electromagnetic coupled with the second stator electrode portion 470 in the outside.
Sending reception control part 430 possesses the control part of transmission 431 and receives control part 432, send control part 431 to the AC signal that the first and second stator electrode portions 460,470 send regulation, receive the signal that control part 432 receives from the first and second stator electrode portions 460,470.
At first, with reference to Fig. 6 (A) the first stator electrode portion 460 and the second stator electrode portion 470 are described.
The first stator electrode portion 460 has: the first sender electrode portion 461, and its electrode wires by the ring-type configuration is constituted; And the first receiving electrode portion 462, it is positioned at the inboard of the first sender electrode portion 461, is made of three electrode wires 462A～462C that form continuous diamond-type coil with prescribed distance respectively, is configured to ring-type as a whole.
Equally, the second stator electrode portion 470 has: the second sender electrode portion 471, and its electrode wires by the ring-type configuration is constituted; And the second receiving electrode portion 472, it is positioned at the inboard of the second sender electrode portion 471, is made of three electrode wires 472A～472C that form continuous diamond-type coil with prescribed distance respectively, is configured to ring-type as a whole.
(462A～462C) constitutes the rhombus in 9 (9 cycles) respectively to constitute the electrode wires of the first receiving electrode portion 462, (472A～472C) constitutes the rhombus in 10 (10 cycles) respectively, three electrode wires phase shiftings in each receiving electrode portion 462,472 and overlay configuration to constitute the electrode wires of the second receiving electrode portion 472.
Among Fig. 6 (A), can find out part that distribution intersects with the direction of drawing quadrature on leave to guarantee insulation.
The first receiving electrode portion 462 and the second receiving electrode portion 472 and will be original one by one independently the structure that is connected by an electrode wires of annulus be equal, promptly each diamond-type coil plays the effect that is equal to a coil.
Wherein, each electrode wires of the first and second sender electrode portions 461,471 is connected and sends on the control part 431, from sending control part 431 applies AC signal from regulation to each electrode wires.
Each electrode wires of the first and second receiving electrode portions 462,472 is connected and receives on the control part 432, the signal of the first and second receiving electrode portions 462,472 is sampled with the sampling period of regulation by receiving control part 432.
Below with reference to Fig. 6 (B) the first coupling electrode portion 480 and the second coupling electrode portion 490 are described.
The first coupling electrode portion 480 constitutes by forming the wavy and configured in one piece electrode wires circlewise of rectangle.The second coupling electrode portion 490 also is same, constitutes by forming the wavy and configured in one piece electrode wires circlewise of rectangle.
In addition, the first coupling electrode portion 480 is the square waves in 9 cycles, and the second coupling electrode portion 490 is the square waves in 10 cycles.And, the square wave of the first coupling electrode portion 480 and the second coupling electrode portion 490 with will be original one by one independently the structure that is connected by an electrode wires of annulus be equal, promptly each square wave plays the effect that equates with a coil.
In this structure,, then around the electrode wires of the first and second sender electrode portions 461,471, produce induced field (B1) when feeding electric currents (alternating current) (i1) time to the first sender electrode portion 461 and the second sender electrode portion 471 respectively from sending control part 431.
So, because the first stator electrode portion 460 and the first coupling electrode portion 480 carry out electromagnetic coupled, the second stator electrode portion 470 and the second coupling electrode portion 490 carry out electromagnetic coupled, so produce induction current (i2) and the generation induced field (B2, B3) by this induction current (i2) in the first coupling electrode portion 480 and the second coupling electrode portion 490.
And, because the first coupling electrode portion 480 and the first receiving electrode portion 462 carry out electromagnetic coupled, the second coupling electrode portion 490 and the second receiving electrode portion 472 carry out electromagnetic coupled, so make the electrode wires of the first receiving electrode portion 462 and the second receiving electrode portion 472 produce induction current (i3) by the magnetic figure (magnetic circle パ タ one Application) of the first coupling electrode portion 480 and the second coupling electrode portion 490.
At this, because with respect to the first coupling electrode portion 480 and the first receiving electrode portion 462 are 9 cycles, and the second coupling electrode portion 490 and the second receiving electrode portion 472 are 10 cycles, so whenever revolve with respect to rotor 420 and to turn around, first detected phase of the first receiving electrode portion 462 is the variations in 10 cycles of expression, and second detected phase of the second receiving electrode portion 472 is represented the variation in 9 cycles.Therefore, anglec of rotation θ (0 °≤θ＜360 °) with respect to rotor 420, first phase signals, phi 1 of the first receiving electrode portion 462 is different with second phase signals, phi 2 of the second receiving electrode portion 472, revolve in the process of turning around at rotor 420, with respect to the anglec of rotation θ of different rotor 420, first phase signals, phi 1 is different with the phase difference φ of second phase signals, phi 2.Therefore, can determine uniquely that according to the phase difference φ of first phase signals, phi 1 and second phase signals, phi 2 rotor 420 revolves the rotatable phase θ that turns around with interior on the contrary.
In addition, be set at about 12.5ms for the signals sampling cycle that the first receiving electrode portion 462 and the second receiving electrode portion 472 carry out by receiving control part 432.
Below, arithmetic processing section 500 is described.
Anglec of rotation calculating part is according to the first receiving electrode portion 462 that is sampled by reception control part 432 and the signal of the second receiving electrode portion 472, ask first phase signals, phi 1 of the first receiving electrode portion 462 and second phase signals, phi 2 of the second receiving electrode portion 472, and then, calculate the anglec of rotation θ (0 °≤θ＜360 °) of rotor 420 according to the poor Δ φ of first phase signals, phi 1 and second phase signals, phi 2.
Rotating cycle calculating part 520 monitors the anglec of rotation θ of the rotor 420 that is calculated by anglec of rotation calculating part 510, and the rotating cycle of rotor 420 is counted.For example, in anglec of rotation calculating part 510, when the phase theta of rotor 420 is 5 ° → 95 ° → 185 ° → 275 ° → 5 ° such variations, from 275 ° to 5 ° change procedure, owing to passed through 360 °, counting has rotated a positive circle for rotor 420.
Equally, be under the situation of 5 ° → 275 ° of variations in the phase theta of rotor 420, owing to reverse rotation has been passed through 360 °, so counting has rotated a negative circle for rotor 420.
Like this, the state that rotating cycle calculating part 520 is positioned at measuring staff 300 reference position is 0 as rotating cycle, and the rotating cycle N of the rotor 420 that from then on begins is counted.Total rotatable phase calculating part 530 calculates total rotatable phase of rotor 420 according to the anglec of rotation θ of the rotor 420 that calculates by the rotating cycle N of the rotor 420 of rotating cycle calculating part 520 countings with by anglec of rotation calculating part 510.For example, rotating cycle N at the rotor of being counted by rotating cycle calculating part 520 420 is 2, and the anglec of rotation θ of the rotor 420 that is calculated by anglec of rotation calculating part 510 is under 45 ° the situation, total then the total rotatable phase that is calculated by rotatable phase calculating part 530 is exactly 765 ° (=360 ° * 2+45 °).
Total rotatable phase of the rotor 420 that the measuring staff position calculation portion total rotatable phase calculating part 530 of 540 bases calculates, the absolute position of calculating measuring staff 300.Whenever revolving the pitch that turns around at measuring staff 300 is 2mm, and total rotatable phase of rotor 420 is under 765 ° the situation, and the absolute position of measuring staff 300 then is 4.25mm (365 ° of=765 ° of ÷ * 2mm).
Wherein, constitute the pick-up unit that detects the measuring staff position by phase signal transmitting element 400 and arithmetic processing section 500.
Below, the action of first embodiment that possesses this structure is described.
At first, after cup 235 rotations that make measuring staff operating portion 230, then first ratchet 242 rotates with cup 235 one.Rotation by the engagement of first ratchet 242 and second ratchet 243 with first ratchet 242 passes to second ratchet 243, and 241 of bolsters are with 243 rotations of second ratchet.Measuring staff 300 rotates with this bolster 241, and by the internal thread 221 of body 200 (rear barrel 220) and the screwing togather of feeding screw thread 310 of measuring staff 300 measuring staff 300 is advanced and retreat in the axial direction.When measuring staff 300 rotations, make rotor 420 with measuring staff 300 rotations by the engagement pin 421 in the slot 320 that is fastened on measuring staff 300.
The rotation of this rotor 420 is detected by stator 410, samples by receiving control part 432 from the signal of each electrode wires of the first receiving electrode portion 462 of stator 410 and the second receiving electrode portion 472.
Then, calculate the anglec of rotation of rotor 420 according to the phase differential of second phase signals, phi 2 of first phase signals, phi 1 of the first receiving electrode portion 462 and the second receiving electrode portion 472 by anglec of rotation calculating part 510.And rotating cycle calculating part 520 monitors the anglec of rotation θ that is calculated by anglec of rotation calculating part 510, and is counted by the rotating cycle of 520 pairs of rotors 420 of rotating cycle calculating part.
According to the anglec of rotation θ of the rotor that calculates by anglec of rotation calculating part 510 with by the rotating cycle of the rotor 420 of rotating cycle calculating part 520 countings, calculate total rotatable phase of rotor 420 by total rotatable phase calculating part 530.Because total rotatable phase of the rotor 420 that total rotatable phase calculating part 530 calculates is total rotatable phases of measuring staff 300, so total rotatable phase and measuring staff according to this measuring staff 300 whenever revolve the advance and retreat pitch (for example 2mm) that turns around, by the absolute position of measuring staff position calculation portion 540 calculating measuring staffs 300.
The measuring staff position that calculates like this shows at digital display part 600.
At this, when the operation by measuring staff operating portion 230 was shifted measuring staff 300 and make measuring staff 300 abut to determinand, then measuring staff 300 can not advance further.At this moment, if exceedingly rotate measuring staff 300, then can be at the load that applies between first ratchet 242 and second ratchet 243 more than the regulation.So first ratchet 242 dallies with respect to second ratchet 243.Because the idle running by this first ratchet 242 makes under the situation more than the given load, the rotary manipulation of measuring staff operating portion 230 can not transmit to measuring staff 300, so measuring staff 300 can not pushed determinand to stipulate above pressure, thereby has prevented the breakage of determinand.
According to possessing this structure first embodiment, can have following effect.
(1) when basis is asked the rotatable phase of measuring staff 300 from the phase signal of phase signal transmitting element 400, since measuring staff 300 revolve turn around in the time first phase signals, phi 1 and second phase signals, phi 2 phase difference φ be different values with respect to the different anglecs of rotation, so can determine the anglec of rotation of measuring staff 300 uniquely according to this phase difference φ.
Therefore, with the signal increment, high speed rotating owing to measuring staff 300 can't not occur and produce signal problem such as skip, not needing to resemble in the past so do not need to limit the rotating speed of measuring staff 300, allow the high speed rotating of measuring staff 300, thereby can improve the operability of milscale 100.
(2) owing to come to determine uniquely the anglec of rotation of measuring staff 300 by phase signal from phase signal transmitting element 400, can not go out the problem that the signal of the such in the past increment type of phenomenon is skipped, so can make fine and closely wovenization of variation of phase signal of the rotation of relative measuring staff 300.Fine and closely wovenization of variation of the phase signal of the rotation by making relative measuring staff 300 like this can improve the resolution for the anglec of rotation of measuring staff 300.Particularly in the present embodiment, increase measuring staff 300 in order to make operability become good and whenever revolved the advance and retreat pitch that turns around, fine and closely wovenization of variation of the phase signal of the rotation of result by making relative measuring staff 300, improved the resolution of the anglec of rotation of measuring staff 300, thereby can detect the displacement of measuring staff with high resolving power.
(3) since phase signal transmitting element 400 just can as long as send phase signal with the interval of the degree that in rotating cycle calculating part 520, the rotating cycle of measuring staff 300 can not skipped, so compare with existing increment type, can reduce the timing that signal sends, its result can reduce power consumption.
(4) since first and second stator electrode portion 460,470 and first and second coupling electrode portion 490 constitute by electrode wires 462A～462C, 472A～472C, so be easy to compactly form the figure of electrode wires.Therefore, can make relative rotor 420 the anglec of rotation phase signal fine and closely wovenization of variation and improve the resolution of the anglec of rotation of rotor 420.In addition, because first and second stator electrode portion 460,470 and first and second coupling electrode portion 490 carry out the signal handing-over by electromagnetic coupled, so the influence that not changed by the gap between stator 410 and the rotor 420, thereby the anglec of rotation of detection rotor 420 exactly.
(5) owing to engagement pin 421 is carried out precompressed to slot 320 by ring-type leaf spring 441 (precompression gives mechanism 440), so engagement pin 421 is seamlessly engaged with slot 320, and the rotation of measuring staff 300 is transmitted to rotor 420 exactly.Therefore, just can detect the anglec of rotation of measuring staff 300 exactly by the anglec of rotation that reads rotor 420 by stator 410.When measuring staff 300 whenever revolves the advance and retreat amount that turns around when big, then be related to the detection error that reads the big measuring staff position of error of the small anglec of rotation, and owing to can detect the anglec of rotation of measuring staff 300 exactly, so can improve the mensuration precision.
(6) even owing to measuring staff 300 also can be kept the position of engagement pin 421 by engagement pin supporting device 450 when rotor 420 is unloaded down, so be easy to once more measuring staff 300 be installed for rotor 420.Therefore can carry out the replacing of measuring staff 300 etc. easily.
(7) owing to be provided with Prossure fixing mechanism 240, so when cup 235 rotations that make measuring staff operating portion 230, when reaching given load when above, then Prossure fixing mechanism 240 idle running can not be transmitted the rotation of cup 235 to measuring staff 300.Like this, the contact pressure in the time of measuring staff 300 can being contacted determinands is limited in below the authorised pressure.Therefore, can be owing to measuring staff 300 makes the determinand breakage.Particularly whenever revolve under the situation of the advance and retreat pitch that turns around at increase measuring staff 300, though because measuring staff 300 might make the determinand breakage to be shifted at a high speed, but in the present embodiment, owing to by Prossure fixing mechanism 240 measuring staff 300 can be rotated to stipulate above load, so can not make the determinand breakage by measuring staff 300.
(8) because phase signal transmitting element 400 is measuring staff 300 to be revolved to turn around carry out absolute sense with the interior anglec of rotation, and mainly constitute, so can make 400 miniaturizations of phase signal transmitting element by stator 410 with measuring staff 300 rotor rotated 420 and the anglec of rotation that detects this rotor 420.For example, also can consider to utilize the scrambler of the absolute position of detecting measuring staff 300, but because the scrambler of the absolute position that this detection of straight lines moves is an orthoscopic,, and be difficult to be suitable for milscale 100 as little measurer so size is very big.But this point is in the present embodiment, owing to only the anglec of rotation θ of measuring staff 300 is carried out absolute sense, thus can realize revolving phase signal transmitting element 400, thus can realize very little size.
(variation)
Below, with reference to Fig. 7～Figure 10 first variation of the present invention～the 4th variation is described.
The basic structure of first variation～the 4th variation is identical with first embodiment, but on the structure that the shape and the precompression of engagement pin 421 gives mechanism 440 characteristics is arranged.
At first, with reference to Fig. 7 first variation is described, engagement pin 421 is threaded in the rotor bushing 423.And the front end of engagement pin 421 sees it is the thin shape of triangularity front end from the side.
With reference to Fig. 8 second variation is described, engagement pin 421 is threaded in the rotor bushing 423.And the front end of engagement pin 421 is frusto-conical.In addition, the slot 320 of measuring staff 300 is the shape with upright sidewall of establishing from the two ends, bottom surface in the sectional view of Fig. 8.
In addition, in first variation and second variation, be screwed on by engagement pin 421 and constitute engagement pin supporting device 450 on the rotor bushing 423.
With reference to Fig. 9 the 3rd variation is described, the front end of engagement pin 421 is tabular surfaces, and the holding section 320 of measuring staff 300 also forms tabular surface.
In addition, be that ring-type leaf spring 441 is embedded from the outside of rotor bushing 423 on this point with first embodiment is identical give mechanism 440 as precompression.
Below, with reference to Figure 10 the 4th variation is described.
The basic structure of the 4th variation is identical with first embodiment, and the other end is pushed leaf spring 442 from engagement pin 421 to slot 320 constitutes but precompression gives that mechanism 440 is fixed on the rotor bushing 423 by an end.And hanging tag by the little pin 422 that is arranged on engagement pin 421 butt sides constitutes engagement pin supporting device 450 on leaf spring 442.
The present invention is not limited to the above embodiments, and the distortion in can reaching the object of the invention scope, improvement etc. are included in the present invention.
Though with the feeding screw thread of measuring staff is that the situation of the big helical pitch of 1mm～2mm is that example is illustrated, the feeding screw thread of measuring staff also can be many screw threads.
It is said structure that the phase signal transmitting element is not limited to, and just can so long as can revolve the structure of carrying out absolute sense with the interior anglec of rotation that turns around to measuring staff.
The phase signal transmitting element if with the anglec of rotation of the sampling interval detection rotor of regulation just can, as long as just the rotating cycle calculating part can come the anglec of rotation of detection rotor can with the degree of the rotating cycle of the rotor of not skipping.In for example during with can be manually operated high rotation speed measuring staff being revolved to turn around, as long as just the anglec of rotation of rotor can be detected can more than three times.
Preferably the rotating cycle calculating part can be stored rotating cycle when the power supply of analyzer disconnects.Like this, when power supply is connected once more, even the rotating cycle that measuring staff is returned not is zero reference position, the absolute position that also can continue to calculate measuring staff.
Being not limited to milscale as analyzer of the present invention, can certainly be that micrometer is first-class, so long as the measuring staff of movable member by being rotated in the axial direction the analyzer of advance and retreat just can.
Claims (7)
1, a kind of analyzer is characterized in that, has:
Body;
Measuring staff, it is screwed on the described body and is arranged to freely advance and retreat in the axial direction by rotation;
The phase signal transmitting element, it sends the phase signal of different value with respect to the different rotary angle of measuring staff according to the rotation of described measuring staff; And
Operation processing unit, it carries out the absolute position that calculation process is asked described measuring staff to described phase signal,
Described phase signal transmitting element sends described phase signal with the interval of regulation,
Described operation processing unit has:
Anglec of rotation calculating part, it calculates the anglec of rotation of described measuring staff according to described phase signal;
The rotating cycle calculating part, its anglec of rotation according to the described measuring staff that is calculated by described anglec of rotation calculating part comes the rotating cycle of described measuring staff is counted;
Total rotatable phase calculating part, it calculates total rotatable phase of described measuring staff according to the anglec of rotation of the measuring staff that calculates by the rotating cycle of the measuring staff of described rotating cycle calculating part counting with by described anglec of rotation calculating part; And
Measuring staff position calculation portion, the absolute position that it calculates described measuring staff according to total rotatable phase of the described measuring staff that is calculated by described total rotatable phase calculating part;
Described phase signal transmitting element has:
A rotor that rotates integratedly with described measuring staff; And
A stator with opposite face relative with described rotor, this stator are arranged on the described body and send the phase signal corresponding with the anglec of rotation of described rotor;
Described stator has rotation that detects described rotor and two sense channels that send different mutually signals on described opposite face, promptly, the first passage that sends first phase signal with send the second channel that carries out second phase signal of different cycle variations with first phase signal
With respect to the different anglec of rotation of described rotor and the phase differential of described first phase signal and described second phase signal is different,
Described anglec of rotation calculating part calculates the anglec of rotation of described rotor according to described phase differential.
2, analyzer as claimed in claim 1 is characterized in that,
Described stator has: be applied in the sender electrode of AC signal and the receiving electrode with test pattern of specified quantity, this test pattern is corresponding with the phase change of one-period,
Described rotor has coupling electrode, and this coupling electrode and described sender electrode and described receiving electrode carry out electromagnetic coupled, and has the test pattern with described receiving electrode respective amount.
3, as claim 1 or the described analyzer of claim 2, it is characterized in that,
Described measuring staff whenever revolves and turns around more than the displacement 1mm.
4, analyzer as claimed in claim 1 is characterized in that,
Described measuring staff has the holding section that is provided with vertically,
Described phase signal transmitting element has: be arranged on the described rotor and the engagement pin that engages with described holding section; And
The precompression that described engagement pin is carried out precompressed to described holding section gives mechanism.
5, analyzer as claimed in claim 4 is characterized in that,
Described engagement pin be configured to respect to described rotor with the direction of the axial quadrature of described measuring staff on be free to slide,
Described precompression gives mechanism to have and is hung tag on described rotor and with the leaf spring of described engagement pin to the described holding section application of force.
6, as claim 4 or the described analyzer of claim 5, it is characterized in that,
Described phase signal transmitting element has the engagement pin supporting device of described engagement pin with respect to described rotor fastening.
7, analyzer as claimed in claim 3 is characterized in that,
Described body has the measuring staff operating portion with the rotation of the described measuring staff of manual operation,
Described measuring staff operating portion has:
Cup, its lateral surface that is provided in described body can rotate;
Prossure fixing mechanism, it is arranged between described cup and the measuring staff, when acting on load between this cup and the described measuring staff less than setting, its with the rotation of described cup to described measuring staff transmission, and when described load is setting when above, it dallies between described cup and described measuring staff.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005213298A JP4732050B2 (en) | 2005-07-22 | 2005-07-22 | Measuring instrument |
| JP213298/05 | 2005-07-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1900649A CN1900649A (en) | 2007-01-24 |
| CN100582645C true CN100582645C (en) | 2010-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610108011.7A Active CN100582645C (en) | 2005-07-22 | 2006-07-24 | Measurement instrument |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7321231B2 (en) |
| EP (1) | EP1746382B1 (en) |
| JP (1) | JP4732050B2 (en) |
| CN (1) | CN100582645C (en) |
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| JP5540308B2 (en) * | 2009-10-16 | 2014-07-02 | 株式会社ミツトヨ | Rotary encoder |
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| WO2018084114A1 (en) * | 2016-11-07 | 2018-05-11 | 株式会社第一測範製作所 | Screw hole inspection device |
| CN108225162A (en) * | 2016-12-13 | 2018-06-29 | 大银微系统股份有限公司 | Absolute position sensing reading head arrangement |
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| JPS54130152A (en) | 1978-03-31 | 1979-10-09 | Sony Corp | Micrometer |
| US4536963A (en) * | 1983-08-29 | 1985-08-27 | Mitutoyo Mfg. Co., Ltd. | Digital indication type measuring machine |
| JPS61111409A (en) * | 1984-11-05 | 1986-05-29 | Mitsutoyo Mfg Co Ltd | Encoder-built-in measuring unit |
| JP3623038B2 (en) * | 1996-02-26 | 2005-02-23 | 株式会社ミツトヨ | Micrometer |
| JP3256443B2 (en) * | 1996-09-20 | 2002-02-12 | 株式会社ミツトヨ | Capacitive displacement measuring device |
| US6329813B1 (en) * | 1998-12-17 | 2001-12-11 | Mitutoyo Corporation | Reduced offset high accuracy induced current absolute position transducer |
| JP3724995B2 (en) | 1999-11-10 | 2005-12-07 | 株式会社ミツトヨ | Micrometer |
| JP3766801B2 (en) | 2001-12-28 | 2006-04-19 | 株式会社ミツトヨ | Measuring instrument |
| JP4088073B2 (en) * | 2002-01-11 | 2008-05-21 | 株式会社ミツトヨ | Absolute position measuring device |
| JP4520722B2 (en) * | 2002-12-10 | 2010-08-11 | 株式会社ミツトヨ | Rotary motion conversion mechanism and measuring machine |
| CN100365375C (en) | 2003-06-09 | 2008-01-30 | 三丰株式会社 | Measuring instrument |
| DE102004006672B3 (en) * | 2004-02-11 | 2005-08-18 | Carl Mahr Holding Gmbh | Fine gauge for distance measurement |
| JP4690028B2 (en) * | 2004-12-17 | 2011-06-01 | 株式会社ミツトヨ | Caliper type micrometer |
| JP4533165B2 (en) * | 2005-01-28 | 2010-09-01 | 株式会社ミツトヨ | Absolute position measuring device |
| JP2007033084A (en) * | 2005-07-22 | 2007-02-08 | Mitsutoyo Corp | Measurement instrument |
-
2005
- 2005-07-22 JP JP2005213298A patent/JP4732050B2/en active Active
-
2006
- 2006-07-17 US US11/487,427 patent/US7321231B2/en active Active
- 2006-07-20 EP EP06015163.6A patent/EP1746382B1/en active Active
- 2006-07-24 CN CN200610108011.7A patent/CN100582645C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN1900649A (en) | 2007-01-24 |
| JP2007033083A (en) | 2007-02-08 |
| US20070018658A1 (en) | 2007-01-25 |
| EP1746382B1 (en) | 2013-09-04 |
| US7321231B2 (en) | 2008-01-22 |
| JP4732050B2 (en) | 2011-07-27 |
| EP1746382A3 (en) | 2012-04-04 |
| EP1746382A2 (en) | 2007-01-24 |
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